HorthooZ – Kerala GK, PSC Questions & Onam Quiz

Q1 Multiple Choice Question

What is the underlying physical principle on which an electrical transformer operates?

A Mutual electromagnetic induction B Self-induction only C Photoelectric emission D Joule heating effect

Q2 Multiple Choice Question

In an electromagnetic wave propagating through vacuum, how is the total energy density ($u$) divided between the electric field ($u_E$) and magnetic field ($u_B$) components?

A Magnetic energy density is zero because magnetic fields carry no energy B Energy density fluctuates randomly without any fixed ratio C Electric energy density is much greater than magnetic energy density ($u_E \gg u_B$) D Electric and magnetic field energy densities are exactly equal ($u_E = u_B = \frac{1}{2} \epsilon_0 E^2 = \frac{1}{2} \frac{B^2}{\mu_0}$)

Q3 Multiple Choice Question

What is the SI unit of self-inductance and mutual inductance, named after American physicist Joseph Henry?

A Coulomb B Siemens C Henry (H) D Farad

Q4 Multiple Choice Question

How do step-up and step-down transformers differ in terms of their primary and secondary coil turns ($N_p$ and $N_s$)?

A Step-down increases voltage while stepping up current B Step-up has more secondary turns ($N_s > N_p$), whereas step-down has more primary turns ($N_p > N_s$) C Step-up has equal turns, step-down has zero primary turns D Step-up converts AC to DC directly

Q5 Multiple Choice Question

What is the mathematical formula for the total electromagnetic force (Lorentz Force) experienced by a charged particle moving in combined electric ($ec{E}$) and magnetic ($ec{B}$) fields?

A \vec{F} = q \vec{v} \times (\vec{E} \cdot \vec{B}) B \vec{F} = q \vec{E} + q (\vec{v} \times \vec{B}) C \vec{F} = \frac{q \vec{E}}{v B} D \vec{F} = q (\vec{E} + \vec{B})

Q6 Multiple Choice Question

What is the term for the average velocity with which free electrons drift towards the positive terminal of a conductor under an electric field?

A Drift velocity B Thermal random velocity C Escape velocity D Speed of light

Q7 Multiple Choice Question

What does the Biot-Savart Law calculate in electromagnetism?

A The refractive index of a magnetic optical medium B The magnetic field produced by a differential current-carrying element ($dec{B} = rac{\mu_0 I dec{l} imes \hat{r}}{4\pi r^2}$) C The induced electromotive force in a rotating coil D The electrostatic force between two stationary point charges

Q8 Multiple Choice Question

What process is used to increase the electrical conductivity of an intrinsic semiconductor (like pure silicon) by adding impurity atoms?

A Doping B Modulation C Polarization D Rectification

Q9 Multiple Choice Question

What is the SI unit of magnetic flux, defined as the total magnetic field passing through a given surface area?

A Henry B Tesla C Weber (Wb) D Gauss

Q10 Multiple Choice Question

How does the electrical resistance ($R$) of a uniform metallic wire vary with its length ($l$) and cross-sectional area ($A$)?

A Proportional to length squared B Directly proportional to area and inversely to length C Independent of length and area D Directly proportional to length and inversely proportional to cross-sectional area ($R =
ho l / A$)

Q11 Multiple Choice Question

Which category of magnetic materials is strongly attracted by a magnet and retains magnetization even after the external magnetic field is removed (e.g., Iron, Cobalt)?

A Diamagnetic materials B Paramagnetic materials C Ferromagnetic materials D Dielectric insulators

Q12 Multiple Choice Question

According to Joule's Law of Heating, the heat ($H$) produced in a resistor is directly proportional to:

A Voltage multiplied by time squared B Inverse of resistance C Square of current, resistance, and time ($H = I^2 R t$) D Current alone without squaring

Q13 Multiple Choice Question

What phenomenon occurs in certain materials when cooled below a specific transition temperature (critical temperature), resulting in zero electrical resistance?

A Superconductivity B Ferromagnetism C Thermoelectric emission D Dielectric breakdown

Q14 Multiple Choice Question

What fundamental discovery was made by Hans Christian Oersted regarding electric current and magnetic fields?

A Electric charges create gravitational repulsion B Magnets can generate nuclear fusion C Electric current flowing through a wire produces a magnetic field around it D Magnetic fields generate static electricity in insulators

Q15 Multiple Choice Question

According to Faraday's Law of Electromagnetic Induction, an electromotive force (emf) is induced in a circuit whenever:

A Magnetic flux remains completely constant and static B There is a change in magnetic flux linked with the circuit C Direct current flows through an open switch D Temperature of the conductor reaches absolute zero

Q16 Multiple Choice Question

What are the essential physical characteristics of the alloy wire used in an electric fuse to protect household circuits?

A Magnetic properties with zero electrical resistance B High melting point and zero resistance C Low resistance and high thermal conductivity D Low melting point and high resistance

Q17 Multiple Choice Question

Which of Maxwell's four equations represents Gauss's Law for Magnetism, stating that magnetic monopoles do not exist?

A \oint \vec{B} \cdot d\vec{A} = 0 (Gauss's Law for Magnetism) B \oint \vec{E} \cdot d\vec{A} = \frac{q}{\epsilon_0} (Gauss's Law for Electricity) C \oint \vec{B} \cdot d\vec{l} = \mu_0 I + \mu_0 \epsilon_0 \frac{d\Phi_E}{dt} (Ampere-Maxwell Law) D \oint \vec{E} \cdot d\vec{l} = -\frac{d\Phi_B}{dt} (Faraday's Law)

Q18 Multiple Choice Question

What is the commercial unit of electrical energy (commonly known as 'one unit' of electricity), and how many Joules does it equal?

A Joule-second, equal to 3.6 x 10^3 Joules B Watt-second, equal to 1 Joule C Kilowatt-hour (kWh), equal to 3.6 x 10^6 Joules D Megawatt-year, equal to 10^9 Joules

Q19 Multiple Choice Question

According to Ohm's Law, what is the exact relationship between potential difference ($V$), current ($I$), and resistance ($R$) at constant temperature?

A V = I * R (Potential difference is directly proportional to current) B I = V * R^2 C R = V * I D V = I / R

Q20 Multiple Choice Question

Ampere's Circuital Law relates the line integral of magnetic field ($ec{B}$) around any closed loop to what quantity enclosed by the loop?

A The total electrostatic charge enclosed within the volume B The rate of change of electric flux through the surface C The total magnetic monopole strength D The total electric current passing through the closed loop multiplied by permeability ($\oint ec{B} \cdot dec{l} = \mu_0 I_{enclosed}$)

Electricity & Magnetism

What is the underlying physical principle on which an electrical transformer operates?

In an electromagnetic wave propagating through vacuum, how is the total energy density ($u$) divided between the electric field ($u_E$) and magnetic field ($u_B$) components?

What is the SI unit of self-inductance and mutual inductance, named after American physicist Joseph Henry?

How do step-up and step-down transformers differ in terms of their primary and secondary coil turns ($N_p$ and $N_s$)?

What is the mathematical formula for the total electromagnetic force (Lorentz Force) experienced by a charged particle moving in combined electric ($ec{E}$) and magnetic ($ec{B}$) fields?

What is the term for the average velocity with which free electrons drift towards the positive terminal of a conductor under an electric field?

What does the Biot-Savart Law calculate in electromagnetism?

What process is used to increase the electrical conductivity of an intrinsic semiconductor (like pure silicon) by adding impurity atoms?

What is the SI unit of magnetic flux, defined as the total magnetic field passing through a given surface area?

How does the electrical resistance ($R$) of a uniform metallic wire vary with its length ($l$) and cross-sectional area ($A$)?

Which category of magnetic materials is strongly attracted by a magnet and retains magnetization even after the external magnetic field is removed (e.g., Iron, Cobalt)?

According to Joule's Law of Heating, the heat ($H$) produced in a resistor is directly proportional to:

What phenomenon occurs in certain materials when cooled below a specific transition temperature (critical temperature), resulting in zero electrical resistance?

What fundamental discovery was made by Hans Christian Oersted regarding electric current and magnetic fields?

According to Faraday's Law of Electromagnetic Induction, an electromotive force (emf) is induced in a circuit whenever:

What are the essential physical characteristics of the alloy wire used in an electric fuse to protect household circuits?

Which of Maxwell's four equations represents Gauss's Law for Magnetism, stating that magnetic monopoles do not exist?

What is the commercial unit of electrical energy (commonly known as 'one unit' of electricity), and how many Joules does it equal?

According to Ohm's Law, what is the exact relationship between potential difference ($V$), current ($I$), and resistance ($R$) at constant temperature?

Ampere's Circuital Law relates the line integral of magnetic field ($ec{B}$) around any closed loop to what quantity enclosed by the loop?

Practice Completed!

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Electricity & Magnetism

What is the underlying physical principle on which an electrical transformer operates?

In an electromagnetic wave propagating through vacuum, how is the total energy density ($u$) divided between the electric field ($u_E$) and magnetic field ($u_B$) components?

What is the SI unit of self-inductance and mutual inductance, named after American physicist Joseph Henry?

How do step-up and step-down transformers differ in terms of their primary and secondary coil turns ($N_p$ and $N_s$)?

What is the mathematical formula for the total electromagnetic force (Lorentz Force) experienced by a charged particle moving in combined electric ($ ec{E}$) and magnetic ($ ec{B}$) fields?

What is the term for the average velocity with which free electrons drift towards the positive terminal of a conductor under an electric field?

What does the Biot-Savart Law calculate in electromagnetism?

What process is used to increase the electrical conductivity of an intrinsic semiconductor (like pure silicon) by adding impurity atoms?

What is the SI unit of magnetic flux, defined as the total magnetic field passing through a given surface area?

How does the electrical resistance ($R$) of a uniform metallic wire vary with its length ($l$) and cross-sectional area ($A$)?

Which category of magnetic materials is strongly attracted by a magnet and retains magnetization even after the external magnetic field is removed (e.g., Iron, Cobalt)?

According to Joule's Law of Heating, the heat ($H$) produced in a resistor is directly proportional to:

What phenomenon occurs in certain materials when cooled below a specific transition temperature (critical temperature), resulting in zero electrical resistance?

What fundamental discovery was made by Hans Christian Oersted regarding electric current and magnetic fields?

According to Faraday's Law of Electromagnetic Induction, an electromotive force (emf) is induced in a circuit whenever:

What are the essential physical characteristics of the alloy wire used in an electric fuse to protect household circuits?

Which of Maxwell's four equations represents Gauss's Law for Magnetism, stating that magnetic monopoles do not exist?

What is the commercial unit of electrical energy (commonly known as 'one unit' of electricity), and how many Joules does it equal?

According to Ohm's Law, what is the exact relationship between potential difference ($V$), current ($I$), and resistance ($R$) at constant temperature?

Ampere's Circuital Law relates the line integral of magnetic field ($ ec{B}$) around any closed loop to what quantity enclosed by the loop?

Practice Completed!

Learn Better with the HorthooZ App

What is the mathematical formula for the total electromagnetic force (Lorentz Force) experienced by a charged particle moving in combined electric ($ec{E}$) and magnetic ($ec{B}$) fields?

Ampere's Circuital Law relates the line integral of magnetic field ($ec{B}$) around any closed loop to what quantity enclosed by the loop?